Flat steel protective sleeve is a device used to protect flat steel. Flat steel is a metal material with a flat shape, which is often used to make various mechanical parts and components. 

Nylon bushing is a type of sleeve used to wrap or protect an object and is made of nylon material. It usually has wear resistance, corrosion resistance and high temperature resistance, and is suitable for various industrial fields.

Oval pipe plug is a device used to seal oval pipe. It is usually made of rubber or other elastic material and has an oval shape to fit the shape of an oval pipe.

A rolling shutter door torsion bar is a device used to operate a rolling shutter door. It is usually made of metal material and has a certain strength and durability.

Belt reel refers to a mechanical device used to transmit power, consisting of one or more belts. It is usually composed of a drive shaft and one or more driven shafts, and the power on the drive shaft is transmitted to the driven shaft through the belt to achieve the operation of the mechanical equipment.

A ladder non-slip cover plug is a device used to prevent a ladder from sliding. It is usually made of a material that is resistant to wear, temperature and pressure, such as rubber or silicone. This device is designed to provide better friction and ensure that the ladder stands firmly during use.

The armrest of a dental chair is usually used to provide support and comfort to the patient. It is generally located on both sides of the chair and can be adjusted as needed.

The beam of the heavy shelf refers to the transverse beam used to support the goods, usually made of high-strength steel. The main role of the heavy shelf beam is to carry the weight of the goods, so that the shelf has better stability and load-bearing capacity.

A circular tube plastic connector is a plastic product used to connect a circular tube. It is usually made of high-strength plastic materials, with corrosion resistance, wear resistance, high temperature resistance and other characteristics.